In order to reduce such accidents, we must detect carbon monoxide and other harmful gases on the spot in a closed environment or poorly ventilated place, adopt advanced and reliable safety alarms, pay close attention to the concentration of these gases in the environment, and detect potential accidents early. Effective measures to avoid accidents and ensure safe industrial safety and family life. Therefore, the research of harmful gas detection methods and the development of combustible gas alarms have become important topics in the field of sensor technology development.